Department of Pharmacy;
Renmin Hospital of Wuhan University;
Wuhan;
Hubei;
430060;
P.R.China;
Department of pharmacy;
Dongfeng Hospital;
Hubei University of Medicine;
Shiyan;
Hubei;
442008;
P.R.China;
Department of endocrinology;
Renmin Hospital of Wuhan University;
Wuhan;
Hubei;
430060;
P.R.China;
Oxycodone; Fentanyl; Patient-controlled analgesia; Meta-analysis;